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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_DEST_WIN_H_
#define CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_DEST_WIN_H_
#include "base/memory/scoped_ptr.h"
#include "content/common/content_export.h"
#include "content/public/common/drop_data.h"
#include "third_party/WebKit/public/web/WebDragOperation.h"
#include "ui/base/dragdrop/drop_target_win.h"
namespace content {
class InterstitialDropTarget;
class RenderViewHost;
class WebContents;
class WebDragDestDelegate;
// A helper object that provides drop capabilities to a WebContentsImpl. The
// DropTarget handles drags that enter the region of the WebContents by
// passing on the events to the renderer.
class CONTENT_EXPORT WebDragDest : public ui::DropTargetWin {
public:
// Create a new WebDragDest associating it with the given HWND and
// WebContents.
WebDragDest(HWND source_hwnd, WebContents* contents);
virtual ~WebDragDest();
DropData* current_drop_data() const { return drop_data_.get(); }
void set_drag_cursor(WebKit::WebDragOperation op) {
drag_cursor_ = op;
}
WebDragDestDelegate* delegate() const { return delegate_; }
void set_delegate(WebDragDestDelegate* d) { delegate_ = d; }
protected:
virtual DWORD OnDragEnter(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect);
virtual DWORD OnDragOver(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect);
virtual void OnDragLeave(IDataObject* data_object);
virtual DWORD OnDrop(IDataObject* data_object,
DWORD key_state,
POINT cursor_position,
DWORD effect);
private:
// Our associated WebContents.
WebContents* web_contents_;
// We keep track of the render view host we're dragging over. If it changes
// during a drag, we need to re-send the DragEnter message. WARNING:
// this pointer should never be dereferenced. We only use it for comparing
// pointers.
RenderViewHost* current_rvh_;
// Used to determine what cursor we should display when dragging over web
// content area. This can be updated async during a drag operation.
WebKit::WebDragOperation drag_cursor_;
// A special drop target handler for when we try to d&d while an interstitial
// page is showing.
scoped_ptr<InterstitialDropTarget> interstitial_drop_target_;
// A delegate that can receive drag information about drag events.
WebDragDestDelegate* delegate_;
// The data for the current drag, or NULL if |context_| is NULL.
scoped_ptr<DropData> drop_data_;
// True if the drag has been canceled.
bool canceled_;
DISALLOW_COPY_AND_ASSIGN(WebDragDest);
};
} // namespace content
#endif // CONTENT_BROWSER_WEB_CONTENTS_WEB_DRAG_DEST_WIN_H_
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